finally working oh my gash

.gitignore

@@ -1,2 +1,4 @@
 .zig-cache/
 main
+test/
+test.zip

basics/.gitignore

@@ -0,0 +1,2 @@
+.zig-cache/
+zig-out/

basics/build.zig

@@ -4,15 +4,17 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
-    const exe = b.addExecutable(.{
-        .name = "HAL-9000",
-        .version = "0.1.0",
-        .debug = true,
+    const root_module = b.createModule(.{
         .root_source_file = b.path("src/main.zig"),
         .target = target,
         .optimize = optimize,
     });
 
+    const exe = b.addExecutable(.{
+        .name = "HAL-9000",
+        .root_module = root_module,
+    });
+
     b.installArtifact(exe);
 
     const run_cmd = b.addRunArtifact(exe);

flake.nix

@@ -15,11 +15,12 @@
       zls = pkgs.zls;
     in {
       devShells.${system}.default = pkgs.mkShell {
-        buildInputs = [ zig zls ];
+        buildInputs = [ zig zls pkgs.openocd ];
         shellHook = ''
           echo "Entering Zig Master Environment"
           echo "Zig: $(zig version)"
           echo "ZLS: $(zls --version)"
+          echo "openocd -f board/ek-tm4c123gxl.cfg -c \"program tiva/zig-out/bin/tiva-app verify reset exit\""
         '';
       };
     };

tiva/build.zig

@@ -4,7 +4,7 @@ pub fn build(b: *std.Build) void {
     const target = b.resolveTargetQuery(.{
         .cpu_arch = .thumb,
         .os_tag = .freestanding,
-        .abi = .eabi,
+        .abi = .eabihf,
         .cpu_model = .{ .explicit = &std.Target.arm.cpu.cortex_m4 },
     });
 
@@ -20,7 +20,7 @@ pub fn build(b: *std.Build) void {
     const cmsis_path = "/home/priec/programs/CMSIS";
 
     // Generic CMSIS Core (for core_cm4.h)
-    tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/CMSIS/Include" });
+    tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/Include" });
     // TM4C Device Specific (for TM4C123GH6PM.h)
     tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/Device/TI/TM4C/Include" });
 
@@ -29,6 +29,10 @@ pub fn build(b: *std.Build) void {
         .root_module = tiva_module,
     });
 
+    const bin = elf.addObjCopy(.{ .format = .bin });
+    const install_bin = b.addInstallBinFile(bin.getOutput(), "tiva-app.bin");
+    b.getInstallStep().dependOn(&install_bin.step);
+
     elf.root_module.strip = true; 
     elf.root_module.omit_frame_pointer = true;
     elf.root_module.unwind_tables = .none;

tiva/src/main.zig

@@ -1,7 +1,54 @@
 const cmsis = @cImport({
+    @cDefine("TM4C123GH6PM", "");
     @cInclude("TM4C123GH6PM.h");
 });
 
-export fn _start() noreturn {
-    while (true) {}
+const GPIO_PORTF_CLK_EN = @as(u32, 0x20); // Bit 5 (Port F)
+const GPIO_PORTF_PIN1_EN = @as(u32, 0x02); // Bit 1
+
+const LED_RED = @as(u32, 0x02);
+
+// export const vector_table linksection(".isr_vector") = [2]usize{
+//     0x20008000,
+//     @intFromPtr(&_start),
+// };
+
+const VectorEntry = extern union {
+    stack_top: u32,
+    handler: *const fn () callconv(.c) noreturn,
+};
+
+export const vector_table linksection(".vector_table") = [_]VectorEntry{
+    .{ .stack_top = 0x20008000 },
+    .{ .handler = &_start },
+};
+
+export fn _start() callconv(.c) noreturn {
+    cmsis.SYSCTL.*.RCGC2 |= GPIO_PORTF_CLK_EN;
+    cmsis.SYSCTL.*.RCGCGPIO |= GPIO_PORTF_CLK_EN;
+    _ = cmsis.SYSCTL.*.RCGCGPIO;
+    _ = cmsis.SYSCTL.*.RCGCGPIO;
+    _ = cmsis.SYSCTL.*.RCGCGPIO;
+
+    cmsis.SYSCTL.*.GPIOHBCTL |= GPIO_PORTF_CLK_EN;
+
+    cmsis.GPIOF_AHB.*.DEN |= GPIO_PORTF_PIN1_EN;
+    cmsis.GPIOF_AHB.*.DIR |= GPIO_PORTF_PIN1_EN;
+    // cmsis.GPIOF_AHB.*.DATA ^= LED_RED;
+
+    const gpiof_data_pf1: *volatile u32 = @ptrFromInt(@intFromPtr(cmsis.GPIOF_AHB) + (LED_RED << 2));
+
+    const DELAY_VALUE = 400000;
+    while (true) {
+        gpiof_data_pf1.* = LED_RED; // LED On
+        Delay(DELAY_VALUE);
+        gpiof_data_pf1.* = 0; // LED off
+        Delay(DELAY_VALUE);
+    }
+}
+
+fn Delay(delay: usize) void {
+    for (0..delay) |_| {
+        asm volatile ("nop");
+    }
 }